A038297 Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*7^j.

1, 9, 7, 81, 126, 49, 729, 1701, 1323, 343, 6561, 20412, 23814, 12348, 2401, 59049, 229635, 357210, 277830, 108045, 16807, 531441, 2480058, 4822335, 5000940, 2917215, 907578, 117649, 4782969, 26040609, 60761421, 78764805

Offset

0,2

References

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

Links

Table of n, a(n) for n=0..31.

Crossrefs

Sequence in context: A231605 A248307 A168159 * A144622 A069242 A071063

Adjacent sequences: A038294 A038295 A038296 * A038298 A038299 A038300

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved